LIFE PROCESSES-RESPIRATION AND TRANSPORTATION CROSSWORD

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Across
  1. 2. blood vessels that return blood to the heart; have valves.
  2. 3. smallest blood vessels with one-cell-thick walls.
  3. 4. pores in plant leaves through which gases are exchanged.
  4. 5. Known as the "energy currency" of the cell.
  5. 8. Branches of trachea entering lungs
  6. 9. Tissue that moves water and minerals upward.
  7. 12. Tiny air sacs where gas exchange occurs.
  8. 13. acid causes muscle cramps when oxygen is lacking.
  9. 15. six-carbon molecule — starting point of respiration.
  10. 16. The liquid part of blood transporting CO2 and nutrients.
  11. 18. main artery carrying oxygenated blood from the heart.
  12. 20. Blood vessels carrying blood away from the heart
  13. 21. The protein in RBCs that carries oxygen.
Down
  1. 1. loss of water vapour from aerial parts of plants.
  2. 6. The end-product of glycolysis.
  3. 7. Cell fragments that help blood to clot.
  4. 10. Tissue that transports products of photosynthesis.
  5. 11. Lower chamber of heart
  6. 14. Respiration that happens without oxygen.
  7. 17. upper chamber of the heart
  8. 19. Organ where exchange of gases takes place in humans.